3 * Copyright (c) 2001 Lutz Mueller <lutz@users.sourceforge.net>
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the
17 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 * Boston, MA 02110-1301 USA.
23 #include <libexif/exif-mnote-data.h>
24 #include <libexif/exif-data.h>
25 #include <libexif/exif-ifd.h>
26 #include <libexif/exif-mnote-data-priv.h>
27 #include <libexif/exif-utils.h>
28 #include <libexif/exif-loader.h>
29 #include <libexif/exif-log.h>
30 #include <libexif/i18n.h>
31 #include <libexif/exif-system.h>
33 #include <libexif/canon/exif-mnote-data-canon.h>
34 #include <libexif/fuji/exif-mnote-data-fuji.h>
35 #include <libexif/olympus/exif-mnote-data-olympus.h>
36 #include <libexif/pentax/exif-mnote-data-pentax.h>
42 #if defined(__WATCOMC__) || defined(_MSC_VER)
43 # define strncasecmp strnicmp
46 #undef JPEG_MARKER_SOI
47 #define JPEG_MARKER_SOI 0xd8
48 #undef JPEG_MARKER_APP0
49 #define JPEG_MARKER_APP0 0xe0
50 #undef JPEG_MARKER_APP1
51 #define JPEG_MARKER_APP1 0xe1
53 static const unsigned char ExifHeader[] = {0x45, 0x78, 0x69, 0x66, 0x00, 0x00};
55 struct _ExifDataPrivate
64 unsigned int ref_count;
66 /* Temporarily used while loading data */
67 unsigned int offset_mnote;
69 ExifDataOption options;
70 ExifDataType data_type;
74 exif_data_alloc (ExifData *data, unsigned int i)
81 d = exif_mem_alloc (data->priv->mem, i);
85 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", i);
90 exif_data_get_mnote_data (ExifData *d)
92 return (d && d->priv) ? d->priv->md : NULL;
98 ExifMem *mem = exif_mem_new_default ();
99 ExifData *d = exif_data_new_mem (mem);
101 exif_mem_unref (mem);
107 exif_data_new_mem (ExifMem *mem)
115 data = exif_mem_alloc (mem, sizeof (ExifData));
118 data->priv = exif_mem_alloc (mem, sizeof (ExifDataPrivate));
120 exif_mem_free (mem, data);
123 data->priv->ref_count = 1;
125 data->priv->mem = mem;
128 for (i = 0; i < EXIF_IFD_COUNT; i++) {
129 data->ifd[i] = exif_content_new_mem (data->priv->mem);
131 exif_data_free (data);
134 data->ifd[i]->parent = data;
137 /* Default options */
138 #ifndef NO_VERBOSE_TAG_STRINGS
140 * When the tag list is compiled away, setting this option prevents
141 * any tags from being loaded
143 exif_data_set_option (data, EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS);
145 exif_data_set_option (data, EXIF_DATA_OPTION_FOLLOW_SPECIFICATION);
147 /* Default data type: none */
148 exif_data_set_data_type (data, EXIF_DATA_TYPE_COUNT);
154 exif_data_new_from_data (const unsigned char *data, unsigned int size)
158 edata = exif_data_new ();
159 exif_data_load_data (edata, data, size);
164 exif_data_load_data_entry (ExifData *data, ExifEntry *entry,
165 const unsigned char *d,
166 unsigned int size, unsigned int offset)
168 unsigned int s, doff;
170 entry->tag = exif_get_short (d + offset + 0, data->priv->order);
171 entry->format = exif_get_short (d + offset + 2, data->priv->order);
172 entry->components = exif_get_long (d + offset + 4, data->priv->order);
174 /* FIXME: should use exif_tag_get_name_in_ifd here but entry->parent
175 * has not been set yet
177 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
178 "Loading entry 0x%x ('%s')...", entry->tag,
179 exif_tag_get_name (entry->tag));
181 /* {0,1,2,4,8} x { 0x00000000 .. 0xffffffff }
182 * -> { 0x000000000 .. 0x7fffffff8 } */
183 s = exif_format_get_size(entry->format) * entry->components;
184 if ((s < entry->components) || (s == 0)){
189 * Size? If bigger than 4 bytes, the actual data is not
190 * in the entry but somewhere else (offset).
193 doff = exif_get_long (d + offset + 8, data->priv->order);
198 if ((doff + s < doff) || (doff + s < s) || (doff + s > size)) {
199 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
200 "Tag data past end of buffer (%u > %u)", doff+s, size);
204 entry->data = exif_data_alloc (data, s);
207 memcpy (entry->data, d + doff, s);
209 /* FIXME: What do our callers do if (entry->data == NULL)? */
210 EXIF_LOG_NO_MEMORY(data->priv->log, "ExifData", s);
213 /* If this is the MakerNote, remember the offset */
214 if (entry->tag == EXIF_TAG_MAKER_NOTE) {
216 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
217 "MakerNote found with empty data");
218 } else if (entry->size > 6) {
219 exif_log (data->priv->log,
220 EXIF_LOG_CODE_DEBUG, "ExifData",
221 "MakerNote found (%02x %02x %02x %02x "
222 "%02x %02x %02x...).",
223 entry->data[0], entry->data[1], entry->data[2],
224 entry->data[3], entry->data[4], entry->data[5],
227 data->priv->offset_mnote = doff;
233 exif_data_save_data_entry (ExifData *data, ExifEntry *e,
234 unsigned char **d, unsigned int *ds,
237 unsigned int doff, s;
241 if (!data || !data->priv)
245 * Each entry is 12 bytes long. The memory for the entry has
246 * already been allocated.
248 exif_set_short (*d + 6 + offset + 0,
249 data->priv->order, (ExifShort) e->tag);
250 exif_set_short (*d + 6 + offset + 2,
251 data->priv->order, (ExifShort) e->format);
253 if (!(data->priv->options & EXIF_DATA_OPTION_DONT_CHANGE_MAKER_NOTE)) {
254 /* If this is the maker note tag, update it. */
255 if ((e->tag == EXIF_TAG_MAKER_NOTE) && data->priv->md) {
256 exif_mem_free (data->priv->mem, e->data);
259 exif_mnote_data_set_offset (data->priv->md, *ds - 6);
260 exif_mnote_data_save (data->priv->md, &e->data, &e->size);
261 e->components = e->size;
265 exif_set_long (*d + 6 + offset + 4,
266 data->priv->order, e->components);
269 * Size? If bigger than 4 bytes, the actual data is not in
270 * the entry but somewhere else.
272 s = exif_format_get_size (e->format) * e->components;
278 * According to the TIFF specification,
279 * the offset must be an even number. If we need to introduce
280 * a padding byte, we set it to 0.
284 t = exif_mem_realloc (data->priv->mem, *d, ts);
286 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", ts);
291 exif_set_long (*d + 6 + offset + 8, data->priv->order, doff);
293 *(*d + *ds - 1) = '\0';
298 /* Write the data. Fill unneeded bytes with 0. Do not crash with
301 memcpy (*d + 6 + doff, e->data, s);
303 memset (*d + 6 + doff, 0, s);
306 memset (*d + 6 + doff + s, 0, (4 - s));
310 exif_data_load_data_thumbnail (ExifData *data, const unsigned char *d,
311 unsigned int ds, ExifLong o, ExifLong s)
314 if ((o + s < o) || (o + s < s) || (o + s > ds) || (o > ds)) {
315 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
316 "Bogus thumbnail offset (%u) or size (%u).",
322 exif_mem_free (data->priv->mem, data->data);
323 if (!(data->data = exif_data_alloc (data, s))) {
324 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", s);
329 memcpy (data->data, d + o, s);
333 #define CHECK_REC(i) \
335 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, \
336 "ExifData", "Recursive entry in IFD " \
337 "'%s' detected. Skipping...", \
338 exif_ifd_get_name (i)); \
341 if (data->ifd[(i)]->count) { \
342 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, \
343 "ExifData", "Attempt to load IFD " \
344 "'%s' multiple times detected. " \
346 exif_ifd_get_name (i)); \
350 /*! Load data for an IFD.
352 * \param[in,out] data #ExifData
353 * \param[in] ifd IFD to load
354 * \param[in] d pointer to buffer containing raw IFD data
355 * \param[in] ds size of raw data in buffer at \c d
356 * \param[in] offset offset into buffer at \c d at which IFD starts
357 * \param[in] recursion_depth number of times this function has been
358 * recursively called without returning
361 exif_data_load_data_content (ExifData *data, ExifIfd ifd,
362 const unsigned char *d,
363 unsigned int ds, unsigned int offset, unsigned int recursion_depth)
365 ExifLong o, thumbnail_offset = 0, thumbnail_length = 0;
371 if (!data || !data->priv)
374 /* check for valid ExifIfd enum range */
375 if ((((int)ifd) < 0) || ( ((int)ifd) >= EXIF_IFD_COUNT))
378 if (recursion_depth > 30) {
379 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifData",
380 "Deep recursion detected!");
384 /* Read the number of entries */
385 if ((offset + 2 < offset) || (offset + 2 < 2) || (offset + 2 > ds)) {
386 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifData",
387 "Tag data past end of buffer (%u > %u)", offset+2, ds);
390 n = exif_get_short (d + offset, data->priv->order);
391 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
392 "Loading %hu entries...", n);
395 /* Check if we have enough data. */
396 if (offset + 12 * n > ds) {
397 n = (ds - offset) / 12;
398 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
399 "Short data; only loading %hu entries...", n);
402 for (i = 0; i < n; i++) {
404 tag = exif_get_short (d + offset + 12 * i, data->priv->order);
406 case EXIF_TAG_EXIF_IFD_POINTER:
407 case EXIF_TAG_GPS_INFO_IFD_POINTER:
408 case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
409 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
410 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
411 o = exif_get_long (d + offset + 12 * i + 8,
413 /* FIXME: IFD_POINTER tags aren't marked as being in a
414 * specific IFD, so exif_tag_get_name_in_ifd won't work
416 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
417 "Sub-IFD entry 0x%x ('%s') at %u.", tag,
418 exif_tag_get_name(tag), o);
420 case EXIF_TAG_EXIF_IFD_POINTER:
421 CHECK_REC (EXIF_IFD_EXIF);
422 exif_data_load_data_content (data, EXIF_IFD_EXIF, d, ds, o, recursion_depth + 1);
424 case EXIF_TAG_GPS_INFO_IFD_POINTER:
425 CHECK_REC (EXIF_IFD_GPS);
426 exif_data_load_data_content (data, EXIF_IFD_GPS, d, ds, o, recursion_depth + 1);
428 case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
429 CHECK_REC (EXIF_IFD_INTEROPERABILITY);
430 exif_data_load_data_content (data, EXIF_IFD_INTEROPERABILITY, d, ds, o, recursion_depth + 1);
432 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
433 thumbnail_offset = o;
434 if (thumbnail_offset && thumbnail_length)
435 exif_data_load_data_thumbnail (data, d,
436 ds, thumbnail_offset,
439 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
440 thumbnail_length = o;
441 if (thumbnail_offset && thumbnail_length)
442 exif_data_load_data_thumbnail (data, d,
443 ds, thumbnail_offset,
453 * If we don't know the tag, don't fail. It could be that new
454 * versions of the standard have defined additional tags. Note that
455 * 0 is a valid tag in the GPS IFD.
457 if (!exif_tag_get_name_in_ifd (tag, ifd)) {
460 * Special case: Tag and format 0. That's against specification
461 * (at least up to 2.2). But Photoshop writes it anyways.
463 if (!memcmp (d + offset + 12 * i, "\0\0\0\0", 4)) {
464 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
465 "Skipping empty entry at position %u in '%s'.", i,
466 exif_ifd_get_name (ifd));
469 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
470 "Unknown tag 0x%04x (entry %u in '%s'). Please report this tag "
471 "to <libexif-devel@lists.sourceforge.net>.", tag, i,
472 exif_ifd_get_name (ifd));
473 if (data->priv->options & EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS)
476 entry = exif_entry_new_mem (data->priv->mem);
477 if (exif_data_load_data_entry (data, entry, d, ds,
479 exif_content_add_entry (data->ifd[ifd], entry);
480 exif_entry_unref (entry);
487 cmp_func (const unsigned char *p1, const unsigned char *p2, ExifByteOrder o)
489 ExifShort tag1 = exif_get_short (p1, o);
490 ExifShort tag2 = exif_get_short (p2, o);
492 return (tag1 < tag2) ? -1 : (tag1 > tag2) ? 1 : 0;
496 cmp_func_intel (const void *elem1, const void *elem2)
498 return cmp_func ((const unsigned char *) elem1,
499 (const unsigned char *) elem2, EXIF_BYTE_ORDER_INTEL);
503 cmp_func_motorola (const void *elem1, const void *elem2)
505 return cmp_func ((const unsigned char *) elem1,
506 (const unsigned char *) elem2, EXIF_BYTE_ORDER_MOTOROLA);
510 exif_data_save_data_content (ExifData *data, ExifContent *ifd,
511 unsigned char **d, unsigned int *ds,
514 unsigned int j, n_ptr = 0, n_thumb = 0;
519 if (!data || !data->priv || !ifd || !d || !ds)
522 for (i = 0; i < EXIF_IFD_COUNT; i++)
523 if (ifd == data->ifd[i])
525 if (i == EXIF_IFD_COUNT)
529 * Check if we need some extra entries for pointers or the thumbnail.
535 * The pointer to IFD_EXIF is in IFD_0. The pointer to
536 * IFD_INTEROPERABILITY is in IFD_EXIF.
538 if (data->ifd[EXIF_IFD_EXIF]->count ||
539 data->ifd[EXIF_IFD_INTEROPERABILITY]->count)
542 /* The pointer to IFD_GPS is in IFD_0. */
543 if (data->ifd[EXIF_IFD_GPS]->count)
552 if (data->ifd[EXIF_IFD_INTEROPERABILITY]->count)
559 * Allocate enough memory for all entries
560 * and the number of entries.
562 ts = *ds + (2 + (ifd->count + n_ptr + n_thumb) * 12 + 4);
563 t = exif_mem_realloc (data->priv->mem, *d, ts);
565 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", ts);
571 /* Save the number of entries */
572 exif_set_short (*d + 6 + offset, data->priv->order,
573 (ExifShort) (ifd->count + n_ptr + n_thumb));
577 * Save each entry. Make sure that no memcpys from NULL pointers are
580 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
581 "Saving %i entries (IFD '%s', offset: %i)...",
582 ifd->count, exif_ifd_get_name (i), offset);
583 for (j = 0; j < ifd->count; j++) {
584 if (ifd->entries[j]) {
585 exif_data_save_data_entry (data, ifd->entries[j], d, ds,
590 offset += 12 * ifd->count;
592 /* Now save special entries. */
597 * The pointer to IFD_EXIF is in IFD_0.
598 * However, the pointer to IFD_INTEROPERABILITY is in IFD_EXIF,
599 * therefore, if IFD_INTEROPERABILITY is not empty, we need
600 * IFD_EXIF even if latter is empty.
602 if (data->ifd[EXIF_IFD_EXIF]->count ||
603 data->ifd[EXIF_IFD_INTEROPERABILITY]->count) {
604 exif_set_short (*d + 6 + offset + 0, data->priv->order,
605 EXIF_TAG_EXIF_IFD_POINTER);
606 exif_set_short (*d + 6 + offset + 2, data->priv->order,
608 exif_set_long (*d + 6 + offset + 4, data->priv->order,
610 exif_set_long (*d + 6 + offset + 8, data->priv->order,
612 exif_data_save_data_content (data,
613 data->ifd[EXIF_IFD_EXIF], d, ds, *ds - 6);
617 /* The pointer to IFD_GPS is in IFD_0, too. */
618 if (data->ifd[EXIF_IFD_GPS]->count) {
619 exif_set_short (*d + 6 + offset + 0, data->priv->order,
620 EXIF_TAG_GPS_INFO_IFD_POINTER);
621 exif_set_short (*d + 6 + offset + 2, data->priv->order,
623 exif_set_long (*d + 6 + offset + 4, data->priv->order,
625 exif_set_long (*d + 6 + offset + 8, data->priv->order,
627 exif_data_save_data_content (data,
628 data->ifd[EXIF_IFD_GPS], d, ds, *ds - 6);
636 * The pointer to IFD_INTEROPERABILITY is in IFD_EXIF.
639 if (data->ifd[EXIF_IFD_INTEROPERABILITY]->count) {
640 exif_set_short (*d + 6 + offset + 0, data->priv->order,
641 EXIF_TAG_INTEROPERABILITY_IFD_POINTER);
642 exif_set_short (*d + 6 + offset + 2, data->priv->order,
644 exif_set_long (*d + 6 + offset + 4, data->priv->order,
646 exif_set_long (*d + 6 + offset + 8, data->priv->order,
648 exif_data_save_data_content (data,
649 data->ifd[EXIF_IFD_INTEROPERABILITY], d, ds,
658 * Information about the thumbnail (if any) is saved in
663 /* EXIF_TAG_JPEG_INTERCHANGE_FORMAT */
664 exif_set_short (*d + 6 + offset + 0, data->priv->order,
665 EXIF_TAG_JPEG_INTERCHANGE_FORMAT);
666 exif_set_short (*d + 6 + offset + 2, data->priv->order,
668 exif_set_long (*d + 6 + offset + 4, data->priv->order,
670 exif_set_long (*d + 6 + offset + 8, data->priv->order,
672 ts = *ds + data->size;
673 t = exif_mem_realloc (data->priv->mem, *d, ts);
675 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData",
681 memcpy (*d + *ds - data->size, data->data, data->size);
684 /* EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH */
685 exif_set_short (*d + 6 + offset + 0, data->priv->order,
686 EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH);
687 exif_set_short (*d + 6 + offset + 2, data->priv->order,
689 exif_set_long (*d + 6 + offset + 4, data->priv->order,
691 exif_set_long (*d + 6 + offset + 8, data->priv->order,
701 /* Sort the directory according to TIFF specification */
702 qsort (*d + 6 + offset - (ifd->count + n_ptr + n_thumb) * 12,
703 (ifd->count + n_ptr + n_thumb), 12,
704 (data->priv->order == EXIF_BYTE_ORDER_INTEL) ? cmp_func_intel : cmp_func_motorola);
706 /* Correctly terminate the directory */
707 if (i == EXIF_IFD_0 && (data->ifd[EXIF_IFD_1]->count ||
711 * We are saving IFD 0. Tell where IFD 1 starts and save
714 exif_set_long (*d + 6 + offset, data->priv->order, *ds - 6);
715 exif_data_save_data_content (data, data->ifd[EXIF_IFD_1], d, ds,
718 exif_set_long (*d + 6 + offset, data->priv->order, 0);
722 EXIF_DATA_TYPE_MAKER_NOTE_NONE = 0,
723 EXIF_DATA_TYPE_MAKER_NOTE_CANON = 1,
724 EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS = 2,
725 EXIF_DATA_TYPE_MAKER_NOTE_PENTAX = 3,
726 EXIF_DATA_TYPE_MAKER_NOTE_NIKON = 4,
727 EXIF_DATA_TYPE_MAKER_NOTE_CASIO = 5,
728 EXIF_DATA_TYPE_MAKER_NOTE_FUJI = 6
729 } ExifDataTypeMakerNote;
731 static ExifDataTypeMakerNote
732 exif_data_get_type_maker_note (ExifData *d)
738 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
740 e = exif_data_get_entry (d, EXIF_TAG_MAKER_NOTE);
742 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
744 /* Olympus & Nikon & Sanyo */
745 if ((e->size >= 8) && ( !memcmp (e->data, "OLYMP", 6) ||
746 !memcmp (e->data, "OLYMPUS", 8) ||
747 !memcmp (e->data, "SANYO", 6) ||
748 !memcmp (e->data, "EPSON", 6) ||
749 !memcmp (e->data, "Nikon", 6)))
750 return EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS;
752 em = exif_data_get_entry (d, EXIF_TAG_MAKE);
754 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
757 if (!strcmp (exif_entry_get_value (em, value, sizeof (value)), "Canon"))
758 return EXIF_DATA_TYPE_MAKER_NOTE_CANON;
760 /* Pentax & some variant of Nikon */
761 if ((e->size >= 2) && (e->data[0] == 0x00) && (e->data[1] == 0x1b)) {
763 exif_entry_get_value (em, value, sizeof(value)),
765 return EXIF_DATA_TYPE_MAKER_NOTE_NIKON;
767 return EXIF_DATA_TYPE_MAKER_NOTE_PENTAX;
769 if ((e->size >= 8) && !memcmp (e->data, "AOC", 4)) {
770 return EXIF_DATA_TYPE_MAKER_NOTE_PENTAX;
772 if ((e->size >= 8) && !memcmp (e->data, "QVC", 4)) {
773 return EXIF_DATA_TYPE_MAKER_NOTE_CASIO;
775 if ((e->size >= 12) && !memcmp (e->data, "FUJIFILM", 8)) {
776 return EXIF_DATA_TYPE_MAKER_NOTE_FUJI;
779 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
782 #define LOG_TOO_SMALL \
783 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifData", \
784 _("Size of data too small to allow for EXIF data."));
787 exif_data_load_data (ExifData *data, const unsigned char *d_orig,
788 unsigned int ds_orig)
793 const unsigned char *d = d_orig;
794 unsigned int ds = ds_orig, len;
796 if (!data || !data->priv || !d || !ds)
799 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
800 "Parsing %i byte(s) EXIF data...\n", ds);
803 * It can be that the data starts with the EXIF header. If it does
804 * not, search the EXIF marker.
810 if (!memcmp (d, ExifHeader, 6)) {
811 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
812 "Found EXIF header.");
815 while ((d[0] == 0xff) && ds) {
820 /* JPEG_MARKER_SOI */
821 if (d[0] == JPEG_MARKER_SOI) {
827 /* JPEG_MARKER_APP0 */
828 if (d[0] == JPEG_MARKER_APP0) {
831 l = (d[0] << 8) | d[1];
839 /* JPEG_MARKER_APP1 */
840 if (d[0] == JPEG_MARKER_APP1)
843 /* Unknown marker or data. Give up. */
844 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
845 "ExifData", _("EXIF marker not found."));
854 len = (d[0] << 8) | d[1];
855 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
856 "We have to deal with %i byte(s) of EXIF data.",
863 * Verify the exif header
864 * (offset 2, length 6).
870 if (memcmp (d, ExifHeader, 6)) {
871 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
872 "ExifData", _("EXIF header not found."));
876 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
877 "Found EXIF header.");
879 /* Byte order (offset 6, length 2) */
882 if (!memcmp (d + 6, "II", 2))
883 data->priv->order = EXIF_BYTE_ORDER_INTEL;
884 else if (!memcmp (d + 6, "MM", 2))
885 data->priv->order = EXIF_BYTE_ORDER_MOTOROLA;
887 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
888 "ExifData", _("Unknown encoding."));
893 if (exif_get_short (d + 8, data->priv->order) != 0x002a)
897 offset = exif_get_long (d + 10, data->priv->order);
898 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
899 "IFD 0 at %i.", (int) offset);
901 /* Parse the actual exif data (usually offset 14 from start) */
902 exif_data_load_data_content (data, EXIF_IFD_0, d + 6, ds - 6, offset, 0);
905 if (offset + 6 + 2 > ds) {
908 n = exif_get_short (d + 6 + offset, data->priv->order);
909 if (offset + 6 + 2 + 12 * n + 4 > ds) {
912 offset = exif_get_long (d + 6 + offset + 2 + 12 * n, data->priv->order);
914 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
915 "IFD 1 at %i.", (int) offset);
918 if (offset > ds - 6) {
919 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
920 "ExifData", "Bogus offset of IFD1.");
922 exif_data_load_data_content (data, EXIF_IFD_1, d + 6, ds - 6, offset, 0);
927 * If we got an EXIF_TAG_MAKER_NOTE, try to interpret it. Some
928 * cameras use pointers in the maker note tag that point to the
929 * space between IFDs. Here is the only place where we have access
932 switch (exif_data_get_type_maker_note (data)) {
933 case EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS:
934 case EXIF_DATA_TYPE_MAKER_NOTE_NIKON:
935 data->priv->md = exif_mnote_data_olympus_new (data->priv->mem);
937 case EXIF_DATA_TYPE_MAKER_NOTE_PENTAX:
938 case EXIF_DATA_TYPE_MAKER_NOTE_CASIO:
939 data->priv->md = exif_mnote_data_pentax_new (data->priv->mem);
941 case EXIF_DATA_TYPE_MAKER_NOTE_CANON:
942 data->priv->md = exif_mnote_data_canon_new (data->priv->mem, data->priv->options);
944 case EXIF_DATA_TYPE_MAKER_NOTE_FUJI:
945 data->priv->md = exif_mnote_data_fuji_new (data->priv->mem);
952 * If we are able to interpret the maker note, do so.
954 if (data->priv->md) {
955 exif_mnote_data_log (data->priv->md, data->priv->log);
956 exif_mnote_data_set_byte_order (data->priv->md,
958 exif_mnote_data_set_offset (data->priv->md,
959 data->priv->offset_mnote);
960 exif_mnote_data_load (data->priv->md, d, ds);
963 if (data->priv->options & EXIF_DATA_OPTION_FOLLOW_SPECIFICATION)
964 exif_data_fix (data);
968 exif_data_save_data (ExifData *data, unsigned char **d, unsigned int *ds)
971 *ds = 0; /* This means something went wrong */
973 if (!data || !d || !ds)
978 *d = exif_data_alloc (data, *ds);
983 memcpy (*d, ExifHeader, 6);
985 /* Order (offset 6) */
986 if (data->priv->order == EXIF_BYTE_ORDER_INTEL) {
987 memcpy (*d + 6, "II", 2);
989 memcpy (*d + 6, "MM", 2);
992 /* Fixed value (2 bytes, offset 8) */
993 exif_set_short (*d + 8, data->priv->order, 0x002a);
996 * IFD 0 offset (4 bytes, offset 10).
997 * We will start 8 bytes after the
998 * EXIF header (2 bytes for order, another 2 for the test, and
999 * 4 bytes for the IFD 0 offset make 8 bytes together).
1001 exif_set_long (*d + 10, data->priv->order, 8);
1003 /* Now save IFD 0. IFD 1 will be saved automatically. */
1004 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
1006 exif_data_save_data_content (data, data->ifd[EXIF_IFD_0], d, ds,
1008 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
1009 "Saved %i byte(s) EXIF data.", *ds);
1013 exif_data_new_from_file (const char *path)
1018 loader = exif_loader_new ();
1019 exif_loader_write_file (loader, path);
1020 edata = exif_loader_get_data (loader);
1021 exif_loader_unref (loader);
1027 exif_data_ref (ExifData *data)
1032 data->priv->ref_count++;
1036 exif_data_unref (ExifData *data)
1041 data->priv->ref_count--;
1042 if (!data->priv->ref_count)
1043 exif_data_free (data);
1047 exif_data_free (ExifData *data)
1050 ExifMem *mem = (data && data->priv) ? data->priv->mem : NULL;
1055 for (i = 0; i < EXIF_IFD_COUNT; i++) {
1057 exif_content_unref (data->ifd[i]);
1058 data->ifd[i] = NULL;
1063 exif_mem_free (mem, data->data);
1068 if (data->priv->log) {
1069 exif_log_unref (data->priv->log);
1070 data->priv->log = NULL;
1072 if (data->priv->md) {
1073 exif_mnote_data_unref (data->priv->md);
1074 data->priv->md = NULL;
1076 exif_mem_free (mem, data->priv);
1077 exif_mem_free (mem, data);
1080 exif_mem_unref (mem);
1084 exif_data_dump (ExifData *data)
1091 for (i = 0; i < EXIF_IFD_COUNT; i++) {
1092 if (data->ifd[i] && data->ifd[i]->count) {
1093 printf ("Dumping IFD '%s'...\n",
1094 exif_ifd_get_name (i));
1095 exif_content_dump (data->ifd[i], 0);
1100 printf ("%i byte(s) thumbnail data available.", data->size);
1101 if (data->size >= 4) {
1102 printf ("0x%02x 0x%02x ... 0x%02x 0x%02x\n",
1103 data->data[0], data->data[1],
1104 data->data[data->size - 2],
1105 data->data[data->size - 1]);
1111 exif_data_get_byte_order (ExifData *data)
1116 return (data->priv->order);
1120 exif_data_foreach_content (ExifData *data, ExifDataForeachContentFunc func,
1128 for (i = 0; i < EXIF_IFD_COUNT; i++)
1129 func (data->ifd[i], user_data);
1132 typedef struct _ByteOrderChangeData ByteOrderChangeData;
1133 struct _ByteOrderChangeData {
1134 ExifByteOrder old, new;
1138 entry_set_byte_order (ExifEntry *e, void *data)
1140 ByteOrderChangeData *d = data;
1145 exif_array_set_byte_order (e->format, e->data, e->components, d->old, d->new);
1149 content_set_byte_order (ExifContent *content, void *data)
1151 exif_content_foreach_entry (content, entry_set_byte_order, data);
1155 exif_data_set_byte_order (ExifData *data, ExifByteOrder order)
1157 ByteOrderChangeData d;
1159 if (!data || (order == data->priv->order))
1162 d.old = data->priv->order;
1164 exif_data_foreach_content (data, content_set_byte_order, &d);
1165 data->priv->order = order;
1167 exif_mnote_data_set_byte_order (data->priv->md, order);
1171 exif_data_log (ExifData *data, ExifLog *log)
1175 if (!data || !data->priv)
1177 exif_log_unref (data->priv->log);
1178 data->priv->log = log;
1181 for (i = 0; i < EXIF_IFD_COUNT; i++)
1182 exif_content_log (data->ifd[i], log);
1185 /* Used internally within libexif */
1186 ExifLog *exif_data_get_log (ExifData *);
1188 exif_data_get_log (ExifData *data)
1190 if (!data || !data->priv)
1192 return data->priv->log;
1195 static const struct {
1196 ExifDataOption option;
1198 const char *description;
1199 } exif_data_option[] = {
1200 {EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS, N_("Ignore unknown tags"),
1201 N_("Ignore unknown tags when loading EXIF data.")},
1202 {EXIF_DATA_OPTION_FOLLOW_SPECIFICATION, N_("Follow specification"),
1203 N_("Add, correct and remove entries to get EXIF data that follows "
1204 "the specification.")},
1205 {EXIF_DATA_OPTION_DONT_CHANGE_MAKER_NOTE, N_("Do not change maker note"),
1206 N_("When loading and resaving Exif data, save the maker note unmodified."
1207 " Be aware that the maker note can get corrupted.")},
1212 exif_data_option_get_name (ExifDataOption o)
1216 for (i = 0; exif_data_option[i].name; i++)
1217 if (exif_data_option[i].option == o)
1219 return _(exif_data_option[i].name);
1223 exif_data_option_get_description (ExifDataOption o)
1227 for (i = 0; exif_data_option[i].description; i++)
1228 if (exif_data_option[i].option == o)
1230 return _(exif_data_option[i].description);
1234 exif_data_set_option (ExifData *d, ExifDataOption o)
1239 d->priv->options |= o;
1243 exif_data_unset_option (ExifData *d, ExifDataOption o)
1248 d->priv->options &= ~o;
1252 fix_func (ExifContent *c, void *UNUSED(data))
1254 switch (exif_content_get_ifd (c)) {
1256 if (c->parent->data)
1257 exif_content_fix (c);
1258 else if (c->count) {
1259 exif_log (c->parent->priv->log, EXIF_LOG_CODE_DEBUG, "exif-data",
1260 "No thumbnail but entries on thumbnail. These entries have been "
1263 unsigned int cnt = c->count;
1264 exif_content_remove_entry (c, c->entries[c->count - 1]);
1265 if (cnt == c->count) {
1267 exif_log (c->parent->priv->log, EXIF_LOG_CODE_DEBUG, "exif-data",
1268 "failed to remove last entry from entries.");
1275 exif_content_fix (c);
1280 exif_data_fix (ExifData *d)
1282 exif_data_foreach_content (d, fix_func, NULL);
1286 exif_data_set_data_type (ExifData *d, ExifDataType dt)
1291 d->priv->data_type = dt;
1295 exif_data_get_data_type (ExifData *d)
1297 return (d && d->priv) ? d->priv->data_type : EXIF_DATA_TYPE_UNKNOWN;